Transmitter-cell.



LG TTSCHALK. TRANSMITTER CELL. APPLICATION HLEO MAR. 31. T916.

Patented Nov. 6, 1917.

J\N a if E E9. 1. wfix INVENTOR ZElz'x GottschaLk UNITED STATES FELIX GOTTSGHALK, OF HILTON, NEW JERSEY.

TRANSMITTER-CELL.

- Specification of Letters-Patent.

' Patented Nov. 1917.

7 Application filed March 31, 1916. Serial No. 87,967.

To all whom it may concern Be it known that I, FELIX GOTTSCHALK, a citizen of the United States, residing at Hilton, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Transmitter-Cells, of which the following is a specification, reference being had to the accompanying drawmg.

My invention relates to transmitter cells. In telephone transmitters and those of similar types embodying a variable resistance medium and electrodes, there is a space between the side of the electrode attached to the vibrating diaphragm and the walls of the chamber inclosing the resistance medium. The coarse grain or shot particles of the resistance medium must not fill the entire inclosure of the chamber to avoid packing and to allow free movement of the vibrating electrode, and, as the transmitter is only operative when held with the vibrating diaphragm substantially vertical, these grains often find lodgment between the sides of the vibrating diaphragm and the walls of the chamber, and have a tendency to make the instrument noisy and frequently cause packing.

My improvement not only confines the variable resistance medium within the closed chamber, but further confines it to contact only with the face of the vibrating electrode without interfering with the free movement thereof.

Another improvement is the provision of free air spaces directly underneath the vibrating diaphragm and within the cell, thereby reducing the air compression therein to a minimum.

In the accompanying drawings, Figure 1 shows a transmitter cell with the granular resistance medium confined to contact only with the face of the vibrating electrode. Fig. 2 is the top view of my improved cell closure showing the spaces therein, whereby the air compression within the cell is reduced.

Like figures of reference denote the same parts wherever they are shown.

1 denotes a free vibrating diaphragm under the periphery of which may be placed a suitable insulating packing 2. Carried by said diaphragm is the movable electrode 3. The cell member is shown at 4, in which is the chamber 5 containing a suitable variable resistance medium and the rear electrode '6.

Surrounding the movable electrode 3 but not touching the same is the member 7, preferably of insulating material; a sufficient space is permitted, to allow free movement of the front electrode.

The member 7 has an annular ring portion indicated at 8 which is connected by radial arms, 9, 10, 11, and 12, to the outer ring, thereby forming the air spaces, 13, 14, 15, and 16. By referring to Fig. 1, it will now be seen that these spaces located directly under the diaphragm, reduce the compression that would otherwise exist if said air spaces were not present.

As the operation of transmitter cells are well understood by those skilled in the art not change the method of operation in any way, I do not describe same here. This cell may be used with any suitable form of trans mitter.

Having thus described my invention I claim:

1. In a transmitter cell, a member forming a chamber, a resistance medium within said chamber, a vibratory member forming a complete closure for said chamber, an electrode secured to the under side of said vibratory member and adapted to act upon said resistance medium and means surrounding said electrode and secured to said cell member whereby said resistance medium is confined in contact to the flat surface of said electrode.

2.'In a transmitter cell, a member forming a chamber, an electrode in said chamber covering the entire bottom thereof, aresistance medium in said chamber, a diaphragm completely closing said chamber, an electrode of less diameter than said chamber secured to the under side of said diaphragm, and a ring secured to said chamber underneath said diaphragm and about said last electrode, whereby said resistance medium is confined in contact to the flat face of said last electrode.

3. In a transmitter, a member forming a chamber, an electrode therein, a resistance medium in said chamber, a diaphragm closing said chamber and carrying an electrode projecting therein, and a member secured to i and as the construction herein described does said first member forming a ring about said first rim and joined to said outer rim last electrode said member having radial thereby forming spaces between said arms, apertures forming air spaces between said and means for securing said outer rim to a first member and diaphragm, substantially cell body,substantially as described.

5 as described. In testimony whereof I hereunto afiiX my 15 l. In a transmitter, an electrode, a cell signature in the presence of two Witnesses.

cover comprising a member having a central FELIX GOTTSCHALK. aperture slightly larger than the electrode, Witnesses:

a rim about said aperture, an outer rim, JoHNC. GORDON, l0 radial arms extending outwardly from said EDMUND R. Donen.

Copies of this patent rnay be obtained for five cents each, by addressing the Commissioner of Patents.

' Washington, D. G. 

